1 . 阅读下面句子，根据句意，从方框中选择恰当的词或词组，并用其正确形式填空。

have an impact on                    boil down to                                 leave out significant                           boost             for instance             be known as

1. Anne Sullivan was a superb teacher who ________________ Hellen Keller.
2. Susan’s success in business ________________ her determination and bravery.
3. They’re building new hotels in order to ________________ tourism in this area.
4. John explained the case to his boss, being careful not to ________________ any important details.
5. The discovery of the new drug is of great ________________ to people suffering from heart disease.
6. We made many improvements to our house. ________________, we painted the walls and bought a sofa.
7. In the third mass extinction, which ________________ the “Great Dying” now, more than 90% of all species died out.

2 . However, what concerned him most was that farmers often had poor harvests and sometimes even had a serious ____________ of food to eat.

A．shortage

B．hybrid

C．crisis

D．boost

E．yield

3 . Indeed, his slim but strong body is just like that of millions of Chinese farmers, to whom he has ____________his life.

A．tackled

B．devoted

C．boosted

D．yielded

E．convinced

4 . In each place we went, we experienced wonderful local dishes, from Guangdong’s ____________ dim sum—small servings of food in bamboo steamers—to the exceptional stewed noodles in Henan.

A．bold

B．stable

C．dairy

D．elegant

E．modest

5 . To sum up,one cannot ____________ the fact that studying abroad has its disadvantages,so when you think about studying abroad,you should consider these many factors.

A．expose

B．motivate

C．grasp

D．behave

E．deny

6 . Snow ____________ that the water pump was to blame.

A．blamed

B．suspected

C．handled

D．linked

E．decreased

7 . The Lemon Melon has a good ________(平衡) of sweet and sour taste.(根据汉语提示单词拼写)

8 . The boy had his leg        because he fell downstairs.

A．break

B．to break

C．breaking

D．broken

9 . It is          to drink some milk or listen to music before going to bed.

A．benefits

B．benefited

C．beneficial

D．benefiting

10 . I’m writing to tell you something about my plan for my study and I also want you to do me a        .

A．patience

B．reaction

C．bond

D．favor